Understanding
the general form of correlation functions in momentum-space conformal field theory is an important goal.
Working in momentum space is natural for many applications, particularly
inflationary cosmology (see, e.g., [1]}, [2]}, [3]}, [4]}, [5]}, [6]}, [7]}, [8]}, [9]}, [10]}, [11]}, [12]}, [13]}, [14]}),
and reveals features inherited from scattering amplitudes that would otherwise be hidden, for example double-copy structure and colour/kinematics duality [15]}, [16]}, [17]}, [18]}, [19]}.
Momentum-space methods are moreover well suited for renormalisation [20]}, [21]}, [22]}, [23]}, and are of growing interest
for the conformal
bootstrap
[24]}, [25]}, [26]}.
